Derrick base



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J. T. HORTQN DERRICK BASE m, .y w 0 mm W m M ,mm y 5 HHHL w, w m /V\\ 4,./Z

Filed Aug l. 1922 JOHN T. HOB/TON, OF BROOKLYN, NEW'YORK.

DERRCK BASE.

.application filed August l, 1922.

To al] ifi/750m il' may concern Be it known that I, Joint 'll Hon'roiv,a citizen oit the United Statesifand a resident ot New lbrk. borough otBrooklyn, in the count)v of Hines and State of New York, have inventedcertain new and useful lmprovements in Derrick Bages, ott which theAfollowing; is a specication.

This invention relates to derrick bases and particularly to devices ofthat class which are adapted for use in connection with the common typeof derrick comprising a verticallv rotatable mast provided with a hingedboom. The object of my improvements is to provide a derrick base having'a non-friction bearing' for the rotation ot the mast and also affordingvieldabilitv inY the relation betweensaid bearing and the toot or socketsupporting the mast. so that limited variation of the mast from itsnormal vertical position when in operation will not militate against theaction of said bearing. Other Afeatures of novelt7 will appear laterhereiny My improvements are illustrated in their preferred embodiment inthe drawing accompanying this specification wherein the .fie-ure is aside elevation, showing my improved base in section, secured to asupport. and so much of the foot of a derriclr as will serve toillustrate inv improvements.

Referringnow to the drawing. support 2 has resting' thereon and securedthereto base plate 3 provided with central vertical openine" ltherethrough. Resting on the upper surface ot base plate 3 is base platecap 5 having a central vertical opening therethrough in alinement withsaid opening 4 of plate 3. Cap 5 is provided with downwardly projectingannular rib 6 in engagement with a corresponding vfrroove in plate 3Jfor maintaining said cap and plate in concentric relation, whilepermittingy Jfree vertical separation of said members when desired.Above said base plate cap and in concentric relation vtherewith is upperplate 7 having aA central vertical opening"r therethrough and providedwith an inner downreaching flange 8 therearound projecting into 'acorrespondingrecess in cap 5. Said upper plate also has an outerdownreaching flange 9 projecting" over the outer edge of said cap 5 andprovided with screw bolts l() in threaded engagement therewith`projecting therethrough and Jfreely engaging annular groove 1l in theouter edge ot' said cap for retaining' said cap and said upper plateSerial No. 573,991.

in coactinp relation and for enabling the members ot thenon-rictionbearing` to be handled as a unit. ln the upper lace ol' base plate cap 5and concentric therewith is annular ball race l2, and in the lower 'faceot upper plate 7 is corresponding ball race 13x said two ball raceshaving` a row oi halls ll. seated therein and therebetween. Saidtiene-es 8 and 9 eilicient to keep dust and dirt out O' saidnon-friction bearing.

The upper portion ot said plate i is provided vvith a spherical bearingl5 concentric with the opening` therethrough. llbove said plate is 'tootpiece t6 havingr a seat therein Vtor niast 'I7 and a'pivotal support torboom 1S. Downreaching1 trom 'toot 1 6 is hollow stem 19 provided aboutits upper portion with spherical bcarino 20 adapted 'for en- ,.Iagenientwith spherical bearingl5 ot cap 7. The lower portion of stem 19 projectsdownwardlj.'v into opening i og base plate fl and is provided thereaboutwith annular groove 2l. saidk base plate beingr provided with pin Q2projecting` into said opening 4 and into engagement with said annulargroove `for retaining bearing 20 ot member 16 in its seat and theseveral members of the device in assembled condition. The diameter 0lStem 19 is smaller than that of openingll: and ,groove 21 tits looselvabout pin 2Q. wherebv a limited amount ot movement ot said stem on itsspherical bearing is pere mitted.

ot the non-friction bearingr with the care otherwise required. Saiddevice also adapts itself to such angular variations incident to thederrick when in use.

l. claim:

1. A derriclr base including in combination a base plate having acentral vertical openingtherethroughL and horizontallyY arranged ballrace about an d concentric with said opening, an upper plate having aball race therein and a vertical central openingI 'liti llOOtherethrough, a row of balls between and seated in said ball races, aspherical bearing in the upper portion of said upper ball race plateconcentric with the opening therethrough, a toot piece having a seattherein for a mast, a stem downwardly reaching from said foot piece, anda spherical bearing about said stem adapted ttor engagement with t-hespherical bearing of said upper ball race plate, said stem projectingdownwardly into the opening in said base plate and being of smallerdiametei` than said base plate opening whereby limited movement ot saidstem on its spherical bearingl is permitted.

2. A derrick base including in combination a base plate having a centralvertical opening therethrough, a base plate cap having a centralvertical opening therethrough and a ball race in its upper tace,coacting means on saidV base plate and cap tor maintaining said membersin (-,oncentriiI relation while permitting free vertical separation ofsaid members, an upper plate having a ball race therein and a verticalcentral opening therethrough, an inner flange and an outer flange onsaid upper plate downreaching over the inner and outer edgesrespectively of said base plate can, a row off balls between and seatedin said ball races, means carried by said upper plate and incngagementwith means on said base plate cap Yfor retaining said upper plate andcap in coacting relation with each other and with said balls, aspherical bearing in the upper portion ot' said upper ball race plateconcentric with the opening therethrough, a Ytoot piece having a seattherein for a mast, a stem downwardly reaching from said Jroot piece,and a spherical bearing about. said,stem adapted for engagement with thespherical bearing of said upper ball race plate, said stem projectingdownwardly into the opening in said base plate and being oisinallerdiameter than said base plate opening whereby limited movement ot saidstem on its spherical bearing is permitted.

A dei-rick base including in combination a base plate having a centralvert-ical opening therethrough and a horizontally arranged ball raceabout and concentric with said opening, an upper plate having a ballrace therein and a vertical central opening therethrough, a row of ballsAbetween and seated in said ball races,'a spherical bearing in the upperportion ol said upper ball race plate concentric with the openingtherethrough, a foot piece having a seat therein for a mast, a stemdownwardly reaching from said foot piece, a spherical bearing about saidstem adapted for engagement with the spherical bearing of said upperball race plate, said stem projecting downwardly into the opening insaid base plate, anY

annular groove about said stem within said 'base plate, and meansprojecting from said while permitting tree vertical separation of saidmembers, an upper plate having a ball race therein `and a verticalcentral opening therethrough and an inner flange and an outer flangedownreaehing over the inner and outer edges respectively ot said baseplate cap, a row ot balls between and seated in said ball races, meanscarried by said upper plate and inwengagement with means on said baseplate cap t'or retaining said upper plate and cap in coacting relationwith each other and with said balls, aV spherical bearing in the upperportion ot said upper ball race plate concentric with the opening therethrough, a foot piece having a seat therein for a mast, a hollow stemdownwardly reaching trom said toot piece, a spherical bearing about saidstem adapted it'or engagement with the spherical bearing of said upperball race plate, said stem projecting downwardly into the opening insaid base plate, an annular groove about said stem within said baseplate, and means projecting from said base plate into said annulargroove for retaining said stein in said base plate, said stem being ot'smaller diameter than said base plate opening whereby limited movementot said stem on its spherical bearing` is permitted.

5. A derrick base including in combination a base plate, a horizontallyrotatable upper plate above said base plate, a non-` triction bearingbetwen said base plate and said upper plate, a toot piece having a seatltherein for a vertically disposed mast, and

a spherical self adjusting seat between said foot piece and said upperplate whereby the 'device is adapted to universal variable -an- JOHN T.HORTON.

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